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Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium ( = 2.5 eV) cathode. Find (a) the maximum kinetic energy of the photoelectrons and (b) the stopping potential. Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium ( = 2.5 eV) cathode. Find(a) the maximum kinetic energy of the photoelectrons and(b) the stopping potential.
(a) K.E. = (hc / ) – 0 = (1242 ev-nm/ 280 nm) – 2.5 ev = 1.9 ev(b) stopping potential is given by ev = K.E.max V = 1.9 ev / e = 1.9 Volt
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